linux-kernel - Re: [PATCH v4 02/11] gpu: ipu-csi: Swap fields according to input/output field types

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Date:   Mon, 8 Oct 2018 14:59:30 -0700
From:   Steve Longerbeam <slongerbeam@...il.com>
To:     Philipp Zabel <p.zabel@...gutronix.de>, linux-media@...r.kernel.org
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        "open list:DRM DRIVERS FOR FREESCALE IMX" 
        <dri-devel@...ts.freedesktop.org>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:STAGING SUBSYSTEM" <devel@...verdev.osuosl.org>,
        "open list:FRAMEBUFFER LAYER" <linux-fbdev@...r.kernel.org>
Subject: Re: [PATCH v4 02/11] gpu: ipu-csi: Swap fields according to
 input/output field types

Hi Philipp,


On 10/05/2018 02:44 AM, Philipp Zabel wrote:
> Hi Steve,
>
> On Thu, 2018-10-04 at 11:53 -0700, Steve Longerbeam wrote:
>
>
>> +
>> +		/* framelines for NTSC / PAL */
>> +		height = (std & V4L2_STD_525_60) ? 525 : 625;
> I think this is a bit convoluted. Instead of initializing std, then
> possibly changing it, and then comparing to the inital value, and then
> checking it again to determine the new height, why not just:
>
> 		if (width == 720 && height == 480) {
> 			std = V4L2_STD_NTSC;
> 			height = 525;
> 		} else if (width == 720 && height == 576) {
> 			std = V4L2_STD_PAL;
> 			height = 625;
> 		} else {
> 			dev_err(csi->ipu->dev,
> 				"Unsupported interlaced video mode\n");
> 			ret = -EINVAL;
> 			goto out_unlock;
> 		}
>
> ?

Yes that was a bit convoluted, fixed.

>
>>   
>>   	/*
>>   	 * if cycles is set, we need to handle this over multiple cycles as
>>   	 * generic/bayer data
>>   	 */
>> -	if (is_parallel_bus(&priv->upstream_ep) && incc->cycles) {
>> -		if_fmt.width *= incc->cycles;
> If the input format width passed to ipu_csi_init_interface is not
> multiplied by the number of cycles per pixel anymore, width in the
> CSI_SENS_FRM_SIZE register will be set to the unmultiplied value from
> infmt.
> This breaks 779680e2e793 ("media: imx: add support for RGB565_2X8 on
> parallel bus").

Oops, that was a mistake, thanks for catching, fixed.

Steve